I have a Dell computer and it has been acting weird for quite some time. i don't have the system disk or whatever that they should send with the computer, all I want to do is put the computer back to the way it was when I got it from dell if that is not possible I am thinking of maybe wiping the hard drive and purchasing a new windows OS and installing it. is it possible to do this? can i just format the hd and then install windows? please help thank you.